Weight of moving parts is extremely important. Lower weight of the head with the piston provides higher the forward speed and thus give more FPS. Additionally impacts on gearbox are not so strong and increases its durability. Offered head offers a very low weight of just 8 grams. Since the material is suitable for the springs M150 max.
Six air channels at the front of the head conduct compressed air under the O-ring. This cause better sealing. Axial bearing provide smooth rotation of the compressed spring.